Monochloromethane thermal chlorination reaction heat recycling system
By adding a reaction heat recovery heat exchanger between the chlorination reactor and the recirculation tower, the problem of high refrigerant and steam consumption in the methane chlorination reaction was solved, achieving efficient utilization of reaction heat and resource conservation.
Patent Information
- Application Number
- CN202422730060.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-11
AI Technical Summary
In the existing methane chlorination process, the reaction outlet temperature is high, the refrigerant consumption is large, the resource waste is serious, and the reboiler steam consumption is high, resulting in high cost.
A reaction heat recovery heat exchanger is added between the chlorination reactor and the recirculation tower. The reaction heat is recovered and utilized through the circulation pumps of the hot and cold media, reducing the consumption of cold media in the quench tower and the steam consumption in the reboiler.
This approach fully utilizes the heat of reaction, reduces refrigerant and steam consumption, lowers production costs, and improves resource utilization.
Smart Images
Figure CN223525644U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat recycling technical field, concretely relates to a methyl chloride thermal chlorination reaction heat recycling system. BACKGROUND
[0002] Methane chlorides are prepared by methyl chloride and chlorine, which is the mainstream technology for preparing methane chlorides at present, and the methyl chloride and chlorine carry out thermal chlorination reaction in a chlorination reactor, a large amount of heat is released during the reaction process, and the reaction discharge temperature is high. The reaction discharge mainly contains hydrogen chloride, unreacted methyl chloride, dichloromethane, trichloromethane and carbon tetrachloride. In order to improve the utilization rate of methyl chloride, it is necessary to separate methyl chloride from the reaction discharge and re-enter the reaction. Firstly, the boiling point of hydrogen chloride is utilized to deeply cool the reaction discharge, and hydrogen chloride gas and crude methane chlorides liquid are separated through gas-liquid separation. The crude methane chlorides liquid enters a recycling column for rectification, so that methyl chloride and dichloromethane and other substances are separated.
[0003] In the traditional methane chlorides production process, the reaction discharge directly enters a quenching tower from the chlorination reactor for cooling, and the temperature of the reaction discharge can be reduced by 300 DEG C after the cooling of the quenching tower. The coolant of the quenching tower is mainly the crude methane chlorides such as dichloromethane after cooling in the subsequent process. However, this method has problems such as large coolant consumption, high cost, insufficient utilization of reaction heat, resource waste and the like. Therefore, a method capable of recycling the reaction heat is needed to solve the above problems. UTILITY MODEL CONTENTS
[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, provide a methyl chloride thermal chlorination reaction heat recycling system, the chlorination reactor and the recycling column are effectively coupled through a reaction heat recovery heat exchanger, the chlorination reaction heat is fully utilized, resource waste is avoided, the coolant consumption of the quenching tower is reduced, and the cost is reduced. Meanwhile, the chlorination reaction heat can also be used to heat the material at the bottom of the recycling column, the steam consumption of the reboiler is reduced, the utilization rate of the reaction heat is improved, and energy saving is realized.
[0005] The technical scheme of the utility model is as follows:
[0006] The heat recovery system of the thermal chlorination reaction of methyl chloride is characterized in that the discharge port of the chlorination reactor is connected with the heat medium inlet of the reaction heat recovery heat exchanger through a heat medium feeding pipeline, the heat medium outlet of the reaction heat recovery heat exchanger is connected with the feeding port of the quenching tower through a heat medium discharge pipeline, the cold medium inlet of the reaction heat recovery heat exchanger is connected with the discharge port of the recirculation tower through a cold medium feeding pipeline, a circulating pump one is installed on the cold medium feeding pipeline, the circulating pump one is electrically connected with the control system, the cold medium outlet of the reaction heat recovery heat exchanger is connected with the circulating feeding port of the recirculation tower through a cold medium discharge pipeline, and the recirculation tower is connected with a reboiler through a pipeline.
[0007] Preferably, the inlet and outlet of the circulating pump one are further connected with a standby cold medium feeding pipeline, a circulating pump two is installed on the standby cold medium feeding pipeline, and the circulating pump two is electrically connected with the control system.
[0008] Preferably, a temperature sensor is arranged on the heat medium discharge pipeline, a flow meter and an adjusting valve are arranged on the cold medium feeding pipeline, and the temperature sensor, the flow meter and the adjusting valve are electrically connected with the control system respectively.
[0009] Preferably, the reaction heat recovery heat exchanger is provided with a liquid level meter, and the liquid level meter is electrically connected with the control system.
[0010] Preferably, a pressure gauge is arranged on the heat medium discharge pipeline.
[0011] Preferably, a temperature sensor and a pressure gauge are arranged on the heat medium feeding pipeline.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] The utility model adds reaction heat recovery heat exchanger between chlorination reactor and quenching tower, and reaction discharge and recirculation tower bottom material carry out heat exchange in reaction heat recovery heat exchanger, and the temperature of reaction discharge after heat exchange can reduce 300 DEG C, and then enter quenching tower and cool down, and the tower bottom material after heat exchange returns to recirculation tower. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the structure schematic diagram of the heat recovery system of the thermal chlorination reaction of methyl chloride of the utility model.
[0015] In the diagram, 1. Chlorination reactor; 2. Heat medium feed line; 3. Reaction heat recovery heat exchanger; 4. Heat medium discharge line; 5. Cold medium feed line; 6. Recirculation tower; 7. Circulation pump one; 8. Cold medium discharge line; 9. Reboiler; 10. Standby cold medium feed line; 11. Circulation pump two; 12. Temperature sensor; 13. Flow meter; 14. Control valve; 15. Level gauge; 16. Pressure gauge; 17. Quenching tower. Detailed Implementation
[0016] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model.
[0017] Example 1
[0018] like Figure 1 As shown, this embodiment provides a system for recovering and utilizing the heat of a chloromethane thermal chlorination reaction. The outlet of the chlorination reactor 1 is connected to the inlet of the heat medium of the reaction heat recovery heat exchanger 3 via a heat medium feed pipeline 2. The outlet of the reaction heat recovery heat exchanger 3 is connected to the inlet of the quench tower 17 via a heat medium discharge pipeline 4. The inlet of the reaction heat recovery heat exchanger 3 is connected to the outlet of the recirculation tower 6 via a cold medium feed pipeline 5. A circulation pump 7 is installed on the cold medium feed pipeline 5 and is electrically connected to the control system. The outlet of the reaction heat recovery heat exchanger 3 is connected to the circulation inlet of the recirculation tower 6 via a cold medium discharge pipeline 8. The recirculation tower 6 is connected to a reboiler 9 via a pipeline.
[0019] In this embodiment, a reaction heat recovery heat exchanger 3 is added between the chlorination reactor 1 and the quench tower 17. The chlorination reaction effluent enters the tube side of the reaction heat recovery heat exchanger 3 via the heat medium feed line 2, while the bottom material of the recirculation tower 6 enters the shell side of the reaction heat recovery heat exchanger 3 via the coolant feed line 5. The bottom material of the recirculation tower 6 is pumped to the reaction heat recovery heat exchanger 3 by the circulation pump 7, heated by the reaction effluent, and then returned to the recirculation tower 6. This utilizes the chlorination reaction effluent to heat the bottom material of the recirculation tower 6, cooling the chlorination reaction effluent before it enters the quench tower 17 for further cooling. This embodiment effectively couples the chlorination reactor 1 and the recirculation tower 6 through the reaction heat recovery heat exchanger 3, fully utilizing the chlorination reaction heat, avoiding resource waste, reducing the coolant consumption of the quench tower 17, and lowering costs. Meanwhile, the reboiler 9 of the recirculation tower 6 uses steam as a heat source. In this embodiment, after adding the reaction heat recovery heat exchanger 3, the heat of chlorination reaction can be used to heat the bottom material of the recirculation tower 6, which reduces the steam consumption of the reboiler 9, improves the utilization rate of reaction heat, and thus achieves energy saving.
[0020] In addition, such as Figure 1As shown, in this embodiment, the inlet and outlet of the circulating pump 7 are also connected with a standby refrigerant feeding pipeline 10, and the circulating pump 2 is installed on the standby refrigerant feeding pipeline 10. Among the two circulating pumps, the circulating pump 2 is in a hot standby state at all times, and after the commonly used circulating pump 7 stops running, the control system starts the hot standby circulating pump 2 in interlock; if the circulating pump 1 and the circulating pump 2 cannot be started normally within a specified time, the reaction discharge will dry out the reaction heat recovery heat exchanger 3, thereby causing equipment damage and accidents, and the control system needs to be interlocked to stop the system, thereby protecting the equipment and preventing accidents.
[0021] Embodiment 2
[0022] On the basis of embodiment 1, as shown in Figure 1 , the heat medium discharge pipeline 4 is provided with a temperature sensor 12, the refrigerant feeding pipeline 5 is provided with a flow meter 13 and an adjusting valve 14, and the temperature sensor 12, the flow meter 13 and the adjusting valve 14 are electrically connected with the control system.
[0023] In this embodiment, the temperature of the heat medium discharge pipeline 4 is monitored, and a high temperature limit value of the heat medium discharge pipeline 4 can be preset in the control system. When the temperature sensor 12 detects that the temperature exceeds the high temperature limit value, it indicates that the heat of the chlorination reaction is not fully utilized, and at this time, the opening of the adjusting valve 14 on the refrigerant feeding pipeline 5 can be adjusted to increase the flow of the tower bottom material of the recirculation tower 6 into the reaction heat recovery heat exchanger 3, so that the temperature of the heat medium discharge pipeline 4 is reduced to below the high temperature limit value, thereby ensuring the full utilization of the reaction heat.
[0024] Embodiment 3
[0025] On the basis of embodiment 2, as shown in Figure 1 , the reaction heat recovery heat exchanger 3 is provided with a liquid level meter 15, and the liquid level meter 15 is electrically connected with the control system. A low liquid level limit value of the shell side of the reaction heat recovery heat exchanger 3 can be preset in the control system. When the liquid level meter 15 detects that the liquid level is lower than the low liquid level limit value, the control system adjusts the opening of the adjusting valve 14 on the refrigerant feeding pipeline 5 to increase the flow of the tower bottom material of the recirculation tower 6 into the reaction heat recovery heat exchanger 3, so that the liquid level of the shell side of the reaction heat recovery heat exchanger 3 is higher than the low liquid level limit value, thereby ensuring the full utilization of the reaction heat.
[0026] Embodiment 4
[0027] On the basis of embodiment 1, as shown in Figure 1 , the heat medium feeding pipeline 2 is provided with a temperature sensor 12 and a pressure gauge 16, and the heat medium discharge pipeline 4 is provided with a pressure gauge 16, which is used to observe the pressure of the heat medium feeding pipeline 2 and the heat medium discharge pipeline 4, thereby ensuring safe production.
Claims
1. A system for recovering heat from a thermal chlorination reaction of methyl chloride, characterized by comprising: The outlet of the chlorination reactor (1) is connected with the heat medium inlet of the reaction heat recovery heat exchanger (3) through a heat medium feeding pipeline (2), the heat medium outlet of the reaction heat recovery heat exchanger (3) is connected with the feeding inlet of the quench tower (17) through a heat medium discharging pipeline (4), the coolant inlet of the reaction heat recovery heat exchanger (3) is connected with the outlet of the recycling tower (6) through a coolant feeding pipeline (5), a circulating pump one (7) is installed on the coolant feeding pipeline (5), the circulating pump one (7) is electrically connected with the control system, the coolant outlet of the reaction heat recovery heat exchanger (3) is connected with the circulating feeding inlet of the recycling tower (6) through a coolant discharging pipeline (8), and the recycling tower (6) is connected with a reboiler (9) through a pipeline.
2. The monochloromethane thermal chlorination reaction heat recovery system according to claim 1, wherein The inlet and outlet of the circulating pump one (7) are further connected with a standby coolant feeding pipeline (10), a circulating pump two (11) is installed on the standby coolant feeding pipeline (10), and the circulating pump two (11) is electrically connected with the control system.
3. The system for recovering heat of the thermal chlorination reaction of methyl chloride according to claim 1, wherein A temperature sensor (12) is arranged on the heat medium discharging pipeline (4), a flow meter (13) and an adjusting valve (14) are arranged on the coolant feeding pipeline (5), and the temperature sensor (12), the flow meter (13) and the adjusting valve (14) are electrically connected with the control system respectively.
4. The monochloromethane thermal chlorination reaction heat recovery system according to claim 3, wherein The reaction heat recovery heat exchanger (3) is provided with a liquid level meter (15), and the liquid level meter (15) is electrically connected with the control system.
5. The monochloromethane thermal chlorination reaction heat recovery system according to claim 3, wherein A pressure gauge (16) is arranged on the heat medium discharging pipeline (4).
6. The methyl chloride thermal chlorination reaction heat recovery system of claim 1, wherein A temperature sensor (12) and a pressure gauge (16) are arranged on the heat medium feeding pipeline (2).